# Bosch Greentherm T9900i SE 199 vs EcoSmart ECO 24: specs and price compared

A sourced, side-by-side comparison of the Bosch Greentherm T9900i SE 199 (Bosch) and EcoSmart ECO 24 (EcoSmart) among tankless water heaters. EcoSmart ECO 24 is the cheaper of the two at $525.

## Side by side

| Spec | Bosch Greentherm T9900i SE 199 | EcoSmart ECO 24 |
| --- | --- | --- |
| US price | $3583.27 | $525 |
| Brand | Bosch | EcoSmart |
| Fuel type | natural-gas | electric |
| Max flow rate gpm | 11.2 | — |
| Max btu per hour | 199000 | — |
| Power input (kW) | — | 24 |
| Uniform energy factor | — | — |
| Condensing type | condensing | electric |
| Min activation flow gpm | 0.45 | 0.3 |
| Vent type | pvc | none |
| Max temp f | 140 | 140 |
| Heat exchanger warranty yrs | 15 | — |
| Wi-Fi enabled | Yes | No |
| Weight (lb) | 85 | 14.25 |

## Key differences

- Fuel type: Bosch Greentherm T9900i SE 199 natural-gas vs EcoSmart ECO 24 electric
- Condensing type: Bosch Greentherm T9900i SE 199 condensing vs EcoSmart ECO 24 electric
- Min activation flow gpm: Bosch Greentherm T9900i SE 199 0.45 vs EcoSmart ECO 24 0.3
- Vent type: Bosch Greentherm T9900i SE 199 pvc vs EcoSmart ECO 24 none
- Wi-Fi enabled: Bosch Greentherm T9900i SE 199 Yes vs EcoSmart ECO 24 No
- Weight (lb): Bosch Greentherm T9900i SE 199 85 vs EcoSmart ECO 24 14.25

## Sources

- Bosch Greentherm T9900i SE 199: https://www.bosch-homecomfort.com/us/en/residential/service-support/discontinued-products/discontinued-water-heating-products/greentherm-9000/ (bosch-homecomfort.com, verified 2026-07-11)
- EcoSmart ECO 24: https://www.ecosmartus.com/product/ecosmart-ECO-24-24-kW-Electric-Tankless-Water-Heater (ecosmartus.com, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/tankless-water-heaters/bosch-greentherm-t9900i-se-199-vs-ecosmart-eco-24/
Cite: Per The Front Desk Review, Bosch Greentherm T9900i SE 199 ($3583.27) vs EcoSmart ECO 24 ($525) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/tankless-water-heaters/bosch-greentherm-t9900i-se-199-vs-ecosmart-eco-24/
License: CC BY 4.0.